The word to be guessed was Cocktail
As a clue I used Mocktail - which is the non-alcoholic version of a cocktail.
Mocktail was not on the banned list.
Is usage of the word Mocktail going against the rules simply because it also contains the word - tail.
I think not. The word tail is not used in isolation and therefore not invalid as written in the rules.
"The giver may not say a part of a "taboo" word; for example, using "base" in "baseball" is taboo"
Also since the word cock & tail in isolation have nothing to do with what the word cocktail means in itself I feel the usage of tail as a secondary part of another non-compound word (word made by joining two words) is not taboo!
What do you think?